37 uterine tumors originally diagnosed as uterine sarcomas at Fondation Bergonié between 1970 and 1982 were histologically reclassified. 15 patients were excluded from this study because of inadequate data or not confirmed initial diagnosis. The 22 remaining cases were classified as leiomyosarcomas 13, endometrial stromal sarcomas 7 and mixed mesodermal sarcomas 2. The mean age of the patients was 56. The cases were classified according to the FIGO staging system. 5 patients had previously undergone (between 1 and 8 years) a subtotal hysterectomy for uterine leiomyoma. 5 patients had stage 1 sarcoma, 13 patients stage III and 2 patients stage IV. 13 patients are dead, 7 are alive without evidence of disease, 2 are alive with evidence of disease. The 5 year actuarial survival rate was 30%. Tumor extent at diagnosis was not correlated with survival. Analysis of failures revealed : 4 metastatic, 5 metastatic and pelvic and 6 isolated pelvic failures. Prognosis was not significantly different between leiomyosarcomas and endometrial stromal sarcomas. There was no pelvic failure in patients with stage I sarcoma (treated by surgery plus radiotherapy). Survival was not found to be correlated with histopathological grade as described in soft tissue sarcomas. Nevertheless a correlation (non significant) was found between survival and mitosis count. Chemotherapy (Cyvadic) was administered in 8 advanced tumors with partial response (always below 50% of the initial tumor) in 5 patients.